<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * CodeIgniter String Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/string_helper.html
 */

// ------------------------------------------------------------------------

class Core_Helper_String
{
	static function wrap_list($str, $list, $pure = false)
  {
		if(empty($list))
			return $str;
			
		$str = html_entity_decode($str, ENT_COMPAT, "UTF-8");

    $trans = array(
			"(Q|q)"	=> 'q',
			"(W|w)"	=> 'w',
			"(E|È|É|Ẹ|Ẻ|Ẽ|Ê|Ề|Ế|Ệ|Ể|Ễ|e|è|é|ẹ|ẻ|ẽ|ê|ề|ế|ệ|ể|ễ)"													=> 'e',
			"(R|r)"	=> 'r',
			"(T|t)"	=> 't',
			"(Y|Ỳ|Ý|Ỵ|Ỷ|Ỹ|y|ỳ|ý|ỵ|ỷ|ỹ)"																									=> 'y',
			"(U|Ù|Ú|Ụ|Ủ|Ũ|Ư|Ừ|Ứ|Ự|Ử|Ữ|u|ù|ú|ụ|ủ|ũ|ư|ừ|ứ|ự|ử|ữ)"													=> 'u',
			"(I|Ì|Í|Ị|Ỉ|Ĩ|i|ì|í|ị|ỉ|ĩ)"																									=> 'i',
			"(O|Ò|Ó|Ọ|Ỏ|Õ|Ô|Ồ|Ố|Ộ|Ổ|Ỗ|Ơ|Ờ|Ớ|Ợ|Ở|Ỡ|o|ò|ó|ọ|ỏ|õ|ô|ồ|ố|ộ|ổ|ỗ|ơ|ờ|ớ|ợ|ở|ỡ)"	=> 'o',
			"(P|p)"	=> 'p',
			"(A|À|Á|Ạ|Ả|Ã|Â|Ầ|Ấ|Ậ|Ẩ|Ẫ|Ă|Ằ|Ắ|Ặ|Ẳ|Ẵ|a|à|á|ạ|ả|ã|â|ầ|ấ|ậ|ẩ|ẫ|ă|ằ|ắ|ặ|ẳ|ẵ)"	=> 'a',
			"(S|s)"	=> 's',
			"(D|Đ|d|đ)"																																	=> 'd',
			"(F|f)"	=> 'f',
			"(G|g)"	=> 'g',
			"(H|h)"	=> 'h',
			"(J|j)"	=> 'j',
			"(K|k)"	=> 'k',
			"(L|l)"	=> 'l',
			"(Z|z)"	=> 'z',
			"(X|x)"	=> 'x',
			"(C|c)"	=> 'c',
			"(V|v)"	=> 'v',
			"(B|b)"	=> 'b',
			"(N|n)"	=> 'n',
			"(M|m)"	=> 'm',
		);

		$keysearch = array();
		foreach($list as $key => $val)
		{
			$newstr = $str;
			if(!$pure)
			{
				$newkey = @preg_replace(array_keys($trans),array_values($trans),$key);
				foreach($trans as $to => $form)
				{
					$newkey = str_replace($form,$to,$newkey);
				}
			}
			$newstr = @preg_replace('/((?![^\<]*>)'.$newkey.')/', $val, $newstr);
			$str 		= empty($newstr)?$str:$newstr;
		}
		
		return $str;
  }
    /**
  * Create URL Title
  *
  * Takes a "title" string as input and creates a
  * human-friendly URL string with either a dash
  * or an underscore as the word separator.
  *
  * @access	public
  * @param	string	the string
  * @param	string	the separator: dash, or underscore
  * @return	string
  */
  static function url_title($str, $separator = 'dash', $lowercase = FALSE, $strip_tags = true)
  {
    if ($separator == 'dash')
    {
      $search		= '_';
      $replace	= '-';
    }
    else
    {
      $search		= '-';
      $replace	= '_';
    }

    $trans = array(
			"(à|á|ạ|ả|ã|â|ầ|ấ|ậ|ẩ|ẫ|ă|ằ|ắ|ặ|ẳ|ẵ)" => 'a',
			"(è|é|ẹ|ẻ|ẽ|ê|ề|ế|ệ|ể|ễ)" 						=> 'e',
			"(ì|í|ị|ỉ|ĩ)"													=> 'i',
			"(ò|ó|ọ|ỏ|õ|ô|ồ|ố|ộ|ổ|ỗ|ơ|ờ|ớ|ợ|ở|ỡ)" => 'o',
			"(ù|ú|ụ|ủ|ũ|ư|ừ|ứ|ự|ử|ữ)"							=> 'u',
			"(ỳ|ý|ỵ|ỷ|ỹ)"													=> 'y',
			"(đ)"																	=> 'd',
			"(À|Á|Ạ|Ả|Ã|Â|Ầ|Ấ|Ậ|Ẩ|Ẫ|Ă|Ằ|Ắ|Ặ|Ẳ|Ẵ)"	=> 'A',
			"(È|É|Ẹ|Ẻ|Ẽ|Ê|Ề|Ế|Ệ|Ể|Ễ)"							=> 'E',
			"(Ì|Í|Ị|Ỉ|Ĩ)"													=> 'I',
			"(Ò|Ó|Ọ|Ỏ|Õ|Ô|Ồ|Ố|Ộ|Ổ|Ỗ|Ơ|Ờ|Ớ|Ợ|Ở|Ỡ)"	=> 'O',
			"(Ù|Ú|Ụ|Ủ|Ũ|Ư|Ừ|Ứ|Ự|Ử|Ữ)"							=> 'U',
			"(Ỳ|Ý|Ỵ|Ỷ|Ỹ)"													=> 'Y',
			"(Đ)"																	=> 'D',
			
			'&\#\d+?;'				=> '',
			'&\S+?;'					=> '',
			'\s+'							=> $replace,
			'[^a-z0-9\-\._]'	=> '',
			$replace.'+'			=> $replace,
			$replace.'$'			=> $replace,
			'^'.$replace			=> $replace,
			'\.+$'						=> ''
		);

    $str = $strip_tags?strip_tags($str):$str;

    foreach ($trans as $key => $val)
    {
      $str = preg_replace("#".$key."#i", $val, $str);
    }

    if ($lowercase === TRUE)
    {
      $str = strtolower($str);
    }

    return trim(stripslashes($str));
  }

  // ------------------------------------------------------------------------
  
  /**
  * Trim Slashes
  *
  * Removes any leading/trailing slashes from a string:
  *
  * /this/that/theother/
  *
  * becomes:
  *
  * this/that/theother
  *
  * @access	public
  * @param	string
  * @return	string
  */
  static function trim_slashes($str)
  {
    return trim($str, '/');
  }
  
  // ------------------------------------------------------------------------

  /**
  * Strip Slashes
  *
  * Removes slashes contained in a string or in an array
  *
  * @access	public
  * @param	mixed	string or array
  * @return	mixed	string or array
  */
  static function strip_slashes($str)
  {
    if (is_array($str))
    {
      foreach ($str as $key => $val)
      {
        $str[$key] = strip_slashes($val);
      }
    }
    else
    {
      $str = stripslashes($str);
    }

    return $str;
  }

  // ------------------------------------------------------------------------

  /**
  * Strip Quotes
  *
  * Removes single and double quotes from a string
  *
  * @access	public
  * @param	string
  * @return	string
  */
  static function strip_quotes($str)
  {
    return str_replace(array('"', "'"), '', $str);
  }

  // ------------------------------------------------------------------------

  /**
  * Quotes to Entities
  *
  * Converts single and double quotes to entities
  *
  * @access	public
  * @param	string
  * @return	string
  */
  static function quotes_to_entities($str)
  {
    return str_replace(array("\'","\"","'",'"'), array("&#39;","&quot;","&#39;","&quot;"), $str);
  }

  // ------------------------------------------------------------------------

  /**
  * Reduce Double Slashes
  *
  * Converts double slashes in a string to a single slash,
  * except those found in http://
  *
  * http://www.some-site.com//index.php
  *
  * becomes:
  *
  * http://www.some-site.com/index.php
  *
  * @access	public
  * @param	string
  * @return	string
  */
  static function reduce_double_slashes($str)
  {
    return preg_replace("#(^|[^:])//+#", "\\1/", $str);
  }

  // ------------------------------------------------------------------------

  /**
  * Reduce Multiples
  *
  * Reduces multiple instances of a particular character.  Example:
  *
  * Fred, Bill,, Joe, Jimmy
  *
  * becomes:
  *
  * Fred, Bill, Joe, Jimmy
  *
  * @access	public
  * @param	string
  * @param	string	the character you wish to reduce
  * @param	bool	TRUE/FALSE - whether to trim the character from the beginning/end
  * @return	string
  */
  static function reduce_multiples($str, $character = ',', $trim = FALSE)
  {
    $str = preg_replace('#'.preg_quote($character, '#').'{2,}#', $character, $str);

    if ($trim === TRUE)
    {
      $str = trim($str, $character);
    }

    return $str;
  }

  // ------------------------------------------------------------------------

  /**
  * Create a Random String
  *
  * Useful for generating passwords or hashes.
  *
  * @access	public
  * @param	string	type of random string.  basic, alpha, alunum, numeric, nozero, unique, md5, encrypt and sha1
  * @param	integer	number of characters
  * @return	string
  */
  static function random_string($type = 'alnum', $len = 8)
  {
    switch($type)
    {
      case 'basic'	: return mt_rand();
        break;
      case 'alnum'	:
      case 'numeric'	:
      case 'nozero'	:
      case 'alpha'	:

          switch ($type)
          {
            case 'alpha'	:	$pool = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
              break;
            case 'alnum'	:	$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
              break;
            case 'numeric'	:	$pool = '0123456789';
              break;
            case 'nozero'	:	$pool = '123456789';
              break;
          }

          $str = '';
          for ($i=0; $i < $len; $i++)
          {
            $str .= substr($pool, mt_rand(0, strlen($pool) -1), 1);
          }
          return $str;
        break;
      case 'unique'	:
      case 'md5'		:

            return md5(uniqid(mt_rand()));
        break;
    }
  }

  // ------------------------------------------------------------------------

  /**
  * Add's _1 to a string or increment the ending number to allow _2, _3, etc
  *
  * @param   string  $str  required
  * @param   string  $separator  What should the duplicate number be appended with
  * @param   string  $first  Which number should be used for the first dupe increment
  * @return  string
  */
  static function increment_string($str, $separator = '_', $first = 1)
  {
    preg_match('/(.+)'.$separator.'([0-9]+)$/', $str, $match);

    return isset($match[2]) ? $match[1].$separator.($match[2] + 1) : $str.$separator.$first;
  }

  // ------------------------------------------------------------------------

  /**
  * Alternator
  *
  * Allows strings to be alternated.  See docs...
  *
  * @access	public
  * @param	string (as many parameters as needed)
  * @return	string
  */
  static function alternator()
  {
    static $i;

    if (func_num_args() == 0)
    {
      $i = 0;
      return '';
    }
    $args = func_get_args();
    return $args[($i++ % count($args))];
  }

  // ------------------------------------------------------------------------

  /**
  * Repeater function
  *
  * @access	public
  * @param	string
  * @param	integer	number of repeats
  * @return	string
  */
  static function repeater($data, $num = 1)
  {
    return (($num > 0) ? str_repeat($data, $num) : '');
  }
  
}

/* End of file string_helper.php */
/* Location: ./system/helpers/string_helper.php */